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Limestone - gypsum method desulphurization process

Country/Region china
Company Yixing Haina Environmental Engineering Co.,Ltd.
Categories Flue Gas Desulfurization Systems
Telephone 0086-510- 80738866
ICP License Issued by the Chinese Ministry
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Limestone - gypsum method desulphurization process

limestone (lime) - gypsum FGD desulphurization process
Boiler flue gas after dust into the absorber. In the absorber, the flue gas flows upward and downward flow of the circulating slurry is washed in a countercurrent manner. Circulating slurry through a nozzle provided in the shotcrete layer jet into the absorber for the removal of SO2, SO3, HCL and HF, the byproduct of the reaction at the same time in the treatment of the forced oxidation process "is introduced by the air oxidation of gypsum (CaSO4 2H2O), and consumption of limestone as the absorbent. Circulating slurry conveyed upward through the slurry circulation pump to the spray level, atomized through the nozzle, gases and liquids can be sufficient contact. Each pump is usually connected with their respective spray level, i.e. usually unit system.
Form gypsum, limestone reacts with the sulfur dioxide in the absorber, in this part of the gypsum slurry through the the gypsum slurry pump discharge, into the gypsum dewatering system. The dewatering system consists mainly of gypsum hydrocyclone (as a dewatering device), the slurry dispenser and the vacuum belt dehydrating machine.
After purification processing flue gas flowing through the two defogger defogging, here the removal of the slurry droplets are carried in the flue gas cleaning. Specific procedures from time to time with the process water the defogger flush. The defogger rinse has two purposes, one is to prevent The defogger clogging, wash water as a supplemental water, stable absorber Level.
Exports in the absorber, the flue gas is generally cooled to about 46 ~ 55 ℃, and saturated with water vapor. GGH (optional) in the flue gas heated to above 80 ℃, in order to improve the lifting height of the flue gas and the diffusion capacity.
Finally, clean the flue gases into the chimney to the atmosphere through the flue.
Desulfurization process is the main reaction
1. SO2 + H2O H2SO3 absorption
2. CaCO3 + H2SO3 CaSO3 + CO2 + H2O in and
3. CaSO3 + 1/2 O2 CaSO4 oxidation
4. CaSO3 + 1/2 H2O CaSO3 1/2H2O crystal
5. CaSO4 + 2H2O CaSO4 2H2O crystal
6. CaSO3 + H2SO3 Ca (HSO3) 2 pH control
HCL, HF, and CaCO3 in the flue gas reaction of CaCl2 or of CaF2. The pH value in the absorber by injecting limestone slurry to adjust and control, and generally the pH value between 5.5 to 6.2.

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